Direct Alkynylation of Thiophenes: Cooperative Activation of TIPS-EBX with Gold and Brønsted Acids
作者:Jonathan P. Brand、Jérôme Waser
DOI:10.1002/anie.201003179
日期:——
United we stand! Cooperativeactivation of the hypervalent‐iodine reagent TIPS‐EBX with a gold catalyst and a Brønstedacid allowed the first direct ethynylation of thiophenes at room temperature (see scheme; TFA=trifluoroacetic acid). The obtained ethynylthiophenes are important building blocks for organic dyes and electronic materials.
The efficient synthesis of morphologically different heteroacenes and the rapid determination of their solid-state and electronic properties are still challenging tasks, which slow down progress in the development of new materials. Here, we report a flexible and efficient synthesis of unprecedented heterotetracenes based on a platinum- and gold-catalyzed cyclization–alkynylation dominoprocess using
Synthesis of 1-[(Triisopropylsilyl)ethynyl]-1λ3,2-benziodoxol-3(1H)-one and Alkynylation of Indoles, Thiophenes, and Anilines
作者:Jérôme Waser、Jonathan Brand
DOI:10.1055/s-0031-1290589
日期:2012.4
An efficient procedure was developed for the synthesis of 1-[(triisopropylsilyl)ethynyl]-1 lambda(3),2-benziodoxol-3(1H)-one on a 100-mmol (36-g) scale. The benziodoxolone can be used for the gold-catalyzed direct alkynylation of indole, 2-hexylthiophene, or N,N-dibenzylaniline on a 5- to 10-mmol scale.